This is a simple tool that convert xls to xml or csv. You need python 2.7 environment to run it. You also need to install xlrd(a python library which can handle xls/xlsx files). Get the latest python 2.7 from http://www.python.org/download/ and install. Get xlrd from https://pypi.python.org/pypi/xlrd
type "python simple_xml_converter.py [file name]" in command line to convert xls/xlsx files. type "python simple_xml_converter.py -h" in command line to see more.
This is free and unencumbered software released into the public domain. For more information, please refer to http://unlicense.org